About Duofold At Duofold they are dedicated to delivering outdoor performance clothing that gives you the freedom to feed your outdoor passions and focus on the job at hand. Combining a history of success stretching back 100 years with the very latest fabric and garment technology Duofold is the brand for those who know what's truly great about the great outdoors. Since 1906 Duofold's innovation and passion to serve the outdoor enthusiast have resulted in hundreds of high-performance products and close relationships with leading organizations - Duofold's outdoor sport Two-Layer thermals were specifically created for the U.S. Army and their extreme Cold Weather Clothing System. - Expedition weight was developed specifically for the U.S. Special Forces. - Duofold is the official base layer supplier of the National Ski Patrol NSP the Professional Ski Instructors of America PSIA and the American Association of Snowboard Instructors AASI. - In 2006 Duofold was the official base layer supplier and provider of luge speed suits for the USA Luge teams. - Duofold is the official base layer supplier to the Yellowstone National Park rangers. Duofold has helped the British Royal Marines successfully reach the South Pole Olympic participants win medals and weekend warriors perform their best under the most challenging conditions. Firemen policemen and U.S. military forces around the world wear Duofold on a daily basis. Whatever activity you choose and whatever the weather-Duofold has you covered.